Clock Tower is an awesome game, period.
The game consists of mostly detective work where investigating certain objects is your only way to make progress. Scissorman only makes it more enjoyable by jumping out of things at random - it's pretty frightening. You don't control the character like in Silent Hill or Fatal Frame; instead, Clock Tower is a point-and-click game that has you telling the character where to move or what to look at. You can play as one of two characters with ten different endings, which gives it a high replay value.
The only downside to Clock Tower is the graphics. The characters are ugly compared to today's standards, and sometimes certain objects are hard to see.
If you are looking for something different, enjoy solving puzzles, and don't care about graphics, you should definitely get this game.